package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.common.TopicPartition;


import java.time.Duration;
import java.util.Collections;
import java.util.Map;
import java.util.Properties;

/**
 * @ClassName 消费者
 * @Description TODO
 * @Author 寇铭
 * @Date 2022/8/5 22:18
 * @Version 1.0
 **/
public class ConsumerQuickStart {

    public static void main(String[] args) {
        //1.添加kafka的配置信息
        Properties properties = new Properties();
        //kafka的连接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.200.130:9092");
        //消费者组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG, "group2");
        //消费的反序列化
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);
        //2.消费者对象
        KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(properties);
        //3.订阅主题
        consumer.subscribe(Collections.singletonList("itheima-topic"));
        //同步异步提交
        try {
            //当前线程一直处于监听状态
            while (true) {
                //4.获取消息
                ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
                for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                    System.out.println(consumerRecord.key());
                    System.out.println(consumerRecord.value());
                    System.out.println(consumerRecord.partition());
                }
                consumer.commitAsync();//异步
            }
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("记录错误信息："+e);
        } finally {
            try {
                consumer.commitSync();//同步
            } finally {
                consumer.close();
            }

        }


//        while (true) {
//            //4.获取消息
//            ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
//            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
//                System.out.println(consumerRecord.key());
//                System.out.println(consumerRecord.value());
//                System.out.println(consumerRecord.partition());
//
//                try {
//                    //同步提交
//                    consumer.commitSync();
//                } catch (Exception e) {
//                    System.out.println("记录提交失败的异常："+e);
//                }
//
//                //异步提交
//                consumer.commitAsync(new OffsetCommitCallback() {
//                    @Override
//                    public void onComplete(Map<TopicPartition, OffsetAndMetadata> map, Exception e) {
//                        if (e != null) {
//                            System.out.println("记录错误的提交偏移量："+ map+",异常信息"+e);
//                        }
//                    }
//                });
//
//            }
//        }

    }

}
